Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 5, Pages 971-974Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.971
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Hot-electron transport in Co/Cu/Co trilayer films has been studied in the energy range from 1.0 to 2.0 eV using ballistic electron magnetic microscopy. Both the spin-dependent attenuation lengths of Co and the cumulative polarizing effects of spin-dependent tunneling and transmission across a Co/Cu interface have been determined. For very thin (a few Angstrom) Co layers, the latter effects result in a weakly majority-spin polarized electron beam above similar to 1.3 eV and a minority-spin polarized beam below similar to 1.2 eV. For thicker Co layers the transmitted beam is always majority-spin polarized.
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